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Hydrated lime or Slaked Lime is a soft, white, crystalline, very slightly water-soluble powder, Ca(OH)₂ obtained by the action of water on lime.

Hydrated lime, also known as calcium hydroxide lime (Ca(OH)₂ is available in white powder form and can be mixed directly in solution tanks and employed in dry form. Hydrated lime is commonly used as a primary coagulant for the treatment of industrial waste streams and contributes to the clarification of water. It is also suitable for use as sludge stabilizer, as well as sludge conditioner for industrial and domestic waste activated sludge. The benefits to using hydrated lime over quicklime is that it doesn’t dematerialize in tank storage, it doesn’t have to be slaked and contains fewer impurities than most quicklime – usually between about 80% and 99% is pure calcium hydroxide lime. Because hydrated lime can be easily handled, smaller water treatment purification plants prefer using it over quicklime to supply additional alkalinity to the water.

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